4. Main performance
(1) deviation: ≤12 jiao fen
(2) the sensitivity level bubble: tilt Angle of 20 points bubble moving 2 ㎜ ≮
5. Dimensions and weight
(1) the GFC – 165 type: inner diameter ф 226 ㎜, 1.6 ㎏
(2) the GFC – 190 type: ф 247 ㎜, inner diameter 1.7 ㎏
For mounted on the repeater compass.By means of aprism and reflection mirror,
sunlight is projected in the form of a line on to the compass card through a slit,thus
making it possible to observe the sun.
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